Vertical grinding-mill.



T..R|OS.

VERTICAL GmNDING MILL; H APPLICATION FILED APR. 191.6.

Patented. July 17, 1917.

2 SHEETS-SHEET l- R O WH m m T T. RIUS.

VERTICAL GRlNDlNG MlLL. MPL10/umn FILED APR. 17, i916.

Patentedl July 17,' 1917.

snEETs-sHEET 2.

INVENTOR WITNESSES:

THOMAS RIOS, 0F SAN' FRANCISCO, CALIFORNIA.

VERTICAL GRIN DIN G-MILL.

Specification of Letters Patent.

Patented July 1 7, 1917.

Application iled April 17, 1916. Serial N0. 91,609.

To all whom t may concern.'

Be it kn Improvements in Vertical Grinding-Mills, of which the followingis a specification.

is invention relates to a grinding mill.

One of the objects of the present invention is to provide a grindingmill of the vertical type, which is struction and grinding disks,together with an automatic feeding mechanism for same and to provide ayielding support for one of the disks, to prevent injury to same ifsolid particles such as stones or pieces of metal should happen to enterwith the product to be ground.

Further objects will hereinafter appear.

he invention consists of the parts and the construction and combinationof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings in whichpartly in secgrindingface ind a base 2. Formed on one side is a pair of journals 3, andextending through said journals is a shaft 14 on the upper end of whichis secured by means of a set screw 16, a disk 15. Suitably secured onthe upper face of said `disk is a grinding disk 417 provided with fourdefinite circuand co-acts evenly distribute the product to be lar rowsof grinding teeth such as indicated at 21, 22, 23 and 24. These teethextend across said rows and the rows are so armediate rows being coarseinner row to he grain is thus iinally discharges in a tally disposeddriving shaft 4 journaled in bearing members 7 carried by the basesection 2 of the frame. The shaft 4 may be driven from any suitablesource of power rect alinement with the shaft 14 is a feed hopper 20 andsecured on the lower end of said feed hopper is a stationary plate 19 towhich is secured a grinding disk 10 constructed similar to the oneindicated at 17. 75

The outer edge of the plate 19 is turned outer edges of the disks 10 and17 so as to deflect the ground material from the disks into a receptaclenot shown. See Figs. 5 and 6. with disks 10 and 19 are supported by abracket arm 30, adjustably secured by means of set Screws 31 to a iibracket arm 30, and stationary grinding disk to be to and from the lowergrinding disk also permits the several when it is 17 and parts to beendesired to clean a feed auger 18. his auger is centrally disposed withrelation to the feed hopper and is sufliciently long to extend aconsiderable distance up into the feed end of the hopper. The interioris provided with spiral ribs 18', the pitch of which is opposite to thepitch of the auger. The auger revolves in unison with the shaft 14 andattached grinding disk 17 with the spiral ribs 18 hopperl so as toautomatically deliver and ground upon a horizon- Arranged in di- Thehopper 20, together Secured to the upper end of the of the hopper in thej a pivotally vit L tween the grinding with relation to the gear.

over the innermost teeth of the grinding disks. The intermediate shaft14 carrying the lower grinding disk 17 is yieldably mounted to permit particles ofmetal lor other hard material entering with the grain todischarge without breaking the burs or grinding teeth of the disks. iThis is accomplished as follows: Pivotally mounted Aas at 11 in the baseframe 2 is a lever 9, upon which is .adjustably mounted a weight 13V.The inner end of the lever is provided with mounted thrust bearing 8which engages the lower end of shaft 14. The beveledgear 6, mounted onthe lower end of the shaft 'is slidably keyed to the shaft to ermitlongitudinal movement of the shaft It can therefore be seen that anyhardarticle entering 4between the disks will merely force the lower disk 17with connected shaft 14 in a downward` direction,'this being permittedas the lower disk is only held against the upper disk by means of theweighted lever 9 and the thrust bearing 8. The amount of pressurebrought to bear by the lower disk against the upper diskmay be varied byadjusting the position of the weight 13. The grinding mill vhereillustrated is particularly constructedV for grindingv niXtamal.Nixtamal is a product produced by grinding half-cooked corn while in awet condition. The doughlorniixture thus produced is particularly usedfor baking tortillas. In actual practice it has 'been found advantageousto grind the half-cooked corn in one operatiOfIly as yregrinding thesame tends to destroy the flavor and aroma `Contained in the corn.

'The operation will be as follows: The

.half-cooked corn is first placed in the hopper 20. Power is thenapplied to the pulley 8b and is thus transmittedY through the shaft 4and the gears 5 and 6 to revolve the shaft 14v and the lower grindingdisk 17. The feed auger will then revolve in unison with same and willconsequently force the corn through the lower end 'of the hopper and outbedisks. The first set of teeth 21 williirst break or tear up theindividual kernels, the second teeth will break the productV stillfiner; the thirdand fourth sets will similarly reduce the corn and willfinally permit same to discharge'in a finely ground condition around theouter periphery of the disks.

By referring to Fig. 8, it twillvbe seen that the` lower disk 17revolves in thedirection of arrow a. This causes the teeth to pull 'awayfrom' each other and therefore to act reverse. This movement tends toeliminate lthe cutting or breaking action usually employed othergrinding' mills and instead produces a mashing tendency which isparticularly beneficial in grinding ,nixtamal receiving hopper or pan'not here shown,

' disks,

may be placed directly below as these are mounted above any `of thelubricated bearings indicated at 3 that no oil or foreign enter 0r mixwith the discharging product. T he yieldable mounting provided for thelower disk positively prevents breaking of the grinding burs formed onthe disks and furthermore provides a means whereby the pressure betweenthe disks may be adjusted to suit various grades of materials.

The machine as a whole is simple and substantial in construction and asthe upper hopper with connected grindingdisk can be removed by simplyreleasing the set screws 31, it can be seen that all parts are easilyaccessible for cleaning purposes or otherwise.

The materials and finish of the several parts of the invention may besuoli as the judgment and experience of the manufacturer may dictate.

I wish it understood that various changes in form, proportions and minordetails of construction may be resorted to within the scope of theappended claims, and that l do not wish to limit myself to the specificdesign and construction here shown.

Having thus described my invention, what 1 claim and desire to secure byLetters Patent `isv u 1. In a grinding and 7, it can be seen matter canpossibly mill, a pair of grinding means for rotating one of said diskswith relation to the other, and a deliector ylate extending downwardlyover the edges of the disks to deflect the ground material downwardlyand away from the disks as it passes from between the disks.

2. ln a grinding mill, a frame formed with an upwardly projectingflange, a bracket having inturned side flanges slidably engaged over andwith the side edges of the iange, a set screw projected through one ofsaid inturned flanges of the bracket andV impinging against the adjacentside edge of the flange, a grinding disk secured to said bracket, and agrinding disk journaled in the frame and cooperating with the firstnamed disk.

3. Tn a grinding mill, a frame, a rotatable grinding disk journaled insaid frame, a bracket slidably mounted on said frame, a grinding disksecured to said bracket in grinding relation to said rotatable disk,means for securing said bracket to said frame with the disks in propergrinding relation to each other, a hopper on said bracket above thedisk, spiralv ribs in the interior of said hopper, and an augerextending from the lrotatable .disk into said hopper in co-actingrelation to said ribs.

4. In a grinding mill, a frame, a hopper i having a base plate rigidlyconnected thereto and provided with a downturned circular ange, agrinding disk secured to the under face of the base plate and spaced atits periphery from the circumference of said flange, a lower grindingdisk extending upwardly within said flange, and means to rotate one ofthe disks witnesses.

THOMAS RIOS.

Witnesses:

FRANCES V. COLE, W. HEALEY.

